如何将Unicode字符串转换为AnsiString?

Trying to move project from Delphi 2007 to Delphi XE4. What is the best way to convert String to AnsiString in Delphi XE4?

试图将项目从Delphi 2007转移到Delphi XE4。在Delphi XE4中，将字符串转换为AnsiString的最佳方式是什么?

1 个解决方案

#1

You simply assign it:

你只是分配:

var
  AnsiStr: AnsiString;
  Str: string;
....
AnsiStr := Str;

The compiler will emit a warning mind you:

编译器会发出警告提醒你:

W1058 Implicit string cast with potential data loss from 'string' to 'AnsiString'

You can use a cast to suppress that warning:

您可以使用cast来抑制该警告:

AnsiStr := AnsiString(Str);

By default that gives no warning, although there is of course still potential for data loss. If you enable warning W1060 then the compiler says:

默认情况下，它不会发出任何警告，尽管数据丢失的可能性仍然存在。如果启用警告W1060，编译器会说:

W1060 Explicit string cast with potential data loss from 'string' to 'AnsiString'

Of course, it's not expected that Delphi XE4 code has much place for the use of AnsiString. Unless you have a very specific interop requirement, then text is best held in the native data type, string. If you want to operate on byte arrays use TBytes or TArray<Byte>.

当然，并不期望Delphi XE4代码有很多地方可以使用AnsiString。除非您有非常特定的互操作需求，否则文本最好保存在本机数据类型string中。如果要对字节数组进行操作，请使用TBytes或TArray< byte >。

#1